Publications

Sih et al. 2017


scientific article | Sci Rep | open access Open access small aa108fa7f478951c693af64a05bc4b46e6711dbb69a20809512a129d4d6b870f

Deep-reef fish assemblages of the Great Barrier Reef shelf-break (Australia)

Sih T, Cappo M, Kingsford M

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Abstract

Tropical mesophotic and sub-mesophotic fish ecology is poorly understood despite increasing vulnerability of deeper fish assemblages. Worldwide there is greater fishing pressure on continental shelf-breaks and the effects of disturbances on deeper fish species have not yet been assessed. Difficult to access, deeper reefs host undocumented fish diversity and abundance. Baited Remote Underwater Video Stations (BRUVS) with lights were used to sample deeper habitats (54–260 m), in the Great Barrier Reef (GBR), Australia. Here we describe fish biodiversity, relative abundance and richness, assessing the prediction that depth would drive assemblage structure in the GBR. Distinct groups of fishes were found with depth whilst overall richness and abundance decreased steeply between 100 and 260 m. Commercially-valuable Lutjanidae species from Pristipomoides and Etelis genera, were absent from shallower depths. Few fish species overlapped between adjacent depth strata, indicating unique assemblages with depth. We also detected new location records and potential new species records. The high biodiversity of fish found in shelf-break environments is poorly appreciated and depth is a strong predictor of assemblage composition. This may pose a challenge for managers of commercial fisheries as distinct depth ranges of taxa may translate to more readily targeted habitats, and therefore, an inherent vulnerability to exploitation.

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Keywords
Meta-data (pending validation)
Depth range
50- 300 m

Mesophotic “mentions”
51 x (total of 6199 words)

Fields
Biodiversity Community structure Fisheries

Research focus
Fishes

Locations
Australia - Great Barrier Reef

Research platforms
Baited Remote Underwater Video (BRUV)
Author profiles
Tiffany Sih ( 1 pubs)